Customer reviews from FIRMAN Power Equipment
Firman - B104201 Zero-E +1000 1040Wh Lithium Iron Phosphate Expansion Battery Pack with USB-C 100W Output (1040 Wh Capacity) - Black
Average customer rating
4
(4 Reviews)
Rating breakdown 4 reviews
5 Stars
3
4 Stars
0
3 Stars
0
2 Stars
0
1 Star
1
67%of customers recommend this product.
(
2 out of
3)
Customer Reviews for Firman - B104201 Zero-E +1000 1040Wh Lithium Iron Phosphate Expansion Battery Pack with USB-C 100W Output (1040 Wh Capacity) - Black
Posted by: Kent
Length of ownership:3 months
Verified Purchase:Yes
Does not increase usage time also, it runs out of juice. fast, so then it clicks over to what’s on the generator, so it is not a well thought of device
No, I would not recommend this to a friend.
Response from FIRMAN Power EquipmentBy FIRMAN Technical support, November 2, 2026
Thank you for sharing your feedback. We're sorry to hear that the Power Pack+ 1000 did not meet your expectations.
The FIRMAN B104201 expansion battery is designed to add 1,040 watt-hours (Wh) of energy storage to your Zero-E Power Station, extending its overall runtime. However, the amount of additional runtime depends on the wattage of the devices being powered.
For example, a device drawing 100 watts could theoretically operate for approximately 10 additional hours, while a device drawing 1,000 watts would use that same stored energy in approximately one hour. Actual runtimes will be somewhat shorter due to normal power conversion losses and operating conditions.
The expansion battery does increase the total available energy, but higher-wattage appliances will consume that additional capacity much faster than smaller devices.
We would welcome the opportunity to learn what appliances you are powering and help determine whether the runtime you're experiencing is consistent with the expected performance. Please contact our Technical Support team at 1-844-FIRMAN1 so we can assist you.
The FIRMAN B104201 expansion battery is designed to add 1,040 watt-hours (Wh) of energy storage to your Zero-E Power Station, extending its overall runtime. However, the amount of additional runtime depends on the wattage of the devices being powered.
For example, a device drawing 100 watts could theoretically operate for approximately 10 additional hours, while a device drawing 1,000 watts would use that same stored energy in approximately one hour. Actual runtimes will be somewhat shorter due to normal power conversion losses and operating conditions.
The expansion battery does increase the total available energy, but higher-wattage appliances will consume that additional capacity much faster than smaller devices.
We would welcome the opportunity to learn what appliances you are powering and help determine whether the runtime you're experiencing is consistent with the expected performance. Please contact our Technical Support team at 1-844-FIRMAN1 so we can assist you.
Written by a customer while visiting FIRMAN Power Equipment
Posted by: Fred
from Godley, Texas
Length of ownership:6 months
Verified Purchase:Yes
Purchased the Zero E Head Unit and extra Expansion Packs to run fans in our horse barn. Very pleased with the product, as we get roughly 25 hours of fan operation.
I would recommend this to a friend!
Written by a customer while visiting FIRMAN Power Equipment
Customer Rating
5
Solar
on May 4, 2026
Posted by: NYsummer99
Best backup I’ve ever had. My solar array is off grid and recharges off 5 hours of sunlight. I’m saving lots of money.
Written by a customer while visiting FIRMAN Power Equipment
Customer Rating
5
Easy addition to increase capacity
on March 24, 2024
Posted by: Oats
from Clearwater FL
Easy to install. With the fast charging and extra capacity it's worth the investment.
I would recommend this to a friend!
Written by a customer while visiting FIRMAN Power Equipment